testing threads

RuPaulThreadsRace.java

public class RuPaulThreadsRace {
    static boolean ready = false;
    static volatile StringBuffer stringBuffer = new StringBuffer();

    private static abstract class Tester extends Thread {
        abstract String name();

        void recursive(int i) {
            if(i==0){ return; }
            stringBuffer.append(name());
            recursive(--i);
        }

        @Override
        public void run() {
            while(!ready) { Thread.yield(); }
            recursive(100);
        }
    }

    public static void main(String[] args) throws InterruptedException {
        System.out.println("In your positions!");
        new Tester() {
            String name() {
                return "A";
            }
        }.start();

        new Tester() {
            String name() {
                return "B";
            }
        }.start();

        System.out.println("ready?!");
        Thread.sleep(10000L);
        System.out.println("GO!");
        ready = true;
        Thread.sleep(1000L);

        System.out.println("Race result: ");
        System.out.println(stringBuffer.toString());
    }
}